1. T. M. Apostol, Calculus, Vol. 2, 2nd ed., Blaisdell, Waltham, MA, 1969.
2. Recursive matrices and umbral calculus
3. Sequences of functions of binomial type
4. F. R. Gantmacher, The Theory of Matrices, Vol. 1, Chelsea, New York, 1960.
5. H. W. Guggenheimer, Differential Geometry, McGraw-Hill, New York, 1963, p. 87.